JPS58225616A - Earthquake resistant apparatus of dry type transformer - Google Patents

Abstract

PURPOSE:To give earthquake resistivity to a transformer and also facilitate installation work by arranging a reinforcing body having the fixing seat to the installation surface of transformer opposing to the end surrace parallel to the stacking direction of transformer core and by tightening the upper fixing seat to the tightening metal of upper iron core with bolts. CONSTITUTION:A reinforcing body 8 is formed by framing L-shaped steel into a triangle form. Another plate is welded to the upper part thereof as a fixing seat 9 to the upper iron core tightening metal 3 of transformer. With the bottom side of a triangle considered as the lower fixing seat 10 to the transformer installing surface 7, the reinforcing body 8 is arranged opposing to both edges parallel to the stacking direction of transformer core. Moreover the upper fixing seat 9 is fixed to the upper iron core clamping metal 3 by tightening a fixing bolt 11 and a bolt hole 12 is bored at the upper fixing seat 9 and thereby the reinforcing body 8 can be fixed after being shifted to the upper or lower side. In case of shifting the transformer with wheels, the reinforcing body 8 is shifted to the upper side, a gap is provided between the lower fixing seat 10 and the installation surface, the reinforcing body 8 is shifted to the lower side, the lower fixing seat 10 is placed closely to the installation surface 7, thereby improving the earthquake resistivity.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an earthquake-resistant device effective for dry type transformers, particularly for transformers with heavy wheels.

As shown in Figs. 1 and 2, the r# vibration device of a conventional 'RL wheeled dry q-pressure vessel includes an iron core 1, a coil 7 and 2, an iron core fastener 6. Since the dry transformer equipped with the wheel device 4 is stacked with bolts 6 passed through the fixed seat 5 of the wheel device, the natural frequency in the stacking direction is relatively low.
There is a possibility of resonance with the earthquake frequency (05 to 1 (IHz)), and the above configuration does not have sufficient earthquake resistance.In particular, the 5 fixed seats of the wheel device and the transformer should be installed so that they can be easily moved. Because there is some clearance between the fixing seat 5 and the mounting surface 7, a large bending load is applied to the fixing bolt B in the event of an earthquake, and the bolt is likely to be destroyed.To eliminate the gap between the fixing seat 5 and the installation surface 7, the transformer ≠ 2. Installation work is difficult.

An object of the present invention is to provide an earthquake-resistant device for a dry type transformer that has sufficient seismic resistance against earthquakes and is easy to install.

In order to make a dry type transformer have a highly earthquake-resistant structure, the natural frequency in the stacking direction of the iron cores must be set at 15H to avoid resonance with that of an earthquake.
It may be 2 or more. As a means to achieve this, the present inventors constructed a reinforcing body that has a fixing seat for fixing the upper core fastener of the transformer on the upper part and a fixing seat for the transformer installation surface on the lower part in the stacking direction of the transformer core. We came up with the idea of fixing the upper part of the transformer to this reinforcing body to prevent the core from swinging in the stacking direction, and confirmed its effectiveness through experiments.

An embodiment of the present invention will be described below with reference to FIGS. 3 to 8.

Fig. 3.4 shows an embodiment in which the present invention is applied to a wheeled dry transformer, and Fig. 5.6 shows a reinforcing body for an earthquake-resistant device.

The reinforcing body 8 illustrated here is made of L-shaped steel framed in a triangular shape,
- Another plate material is welded to the upper part to serve as a fixing seat 9 to the upper core fastener 3 of the transformer, and the base of the triangle is used as the pressure accumulator installation surface 7.
The stretchable member 8 is arranged to face both end faces (only one end face is shown in the figure) parallel to the stacking direction of the transformer core 1, and the - upper fixed seat Tighten and secure the upper core fastener 3 of the 9f transformer with the pole bolt 11. Reference numeral 12 denotes a hole in the upper fixing seat 9. In order to be able to shift and fix the reinforcing body 8 up and down, it is recommended that at least one of the bolt holes of the upper fixing seat 9 and the upper core fastener 3 be made into an elongated hole, or provided in two stages above and below [No. 5] See Figures (a) and (b)]. In this way, when moving by wheel, the reinforcing body 8 is shifted upward, and a gap is created between the lower fixed seat 10 and the installation surface 70 to facilitate lI & movement.
In some cases, the reinforcing body 8 can be moved downward, and the lower fixing seat 10 can be firmly fixed with the bolts 13 when the lower fixing seat 10 is in close contact with the installation surface 7.

Reinforcement body 8 fixed to standing surface 7 as shown in Figure 6.4
By fixing the upper part of the transformer in place, the seismic strength of the transformer in the core stacking direction is improved to +11iiT, which eliminates the need to lift the station voltage transformer with jacks and remove the wheels at the 11th stage of installation, making maintenance and inspection easier. Daytime earthquake resistance can be provided without sacrificing the characteristics of wheeled transformers that are easy to move when needed.

Fig. 7.8 shows another embodiment of the present invention applied to a dry type transformer without a wheel device. In one embodiment, a stay 14 is placed in the center of the reinforcing body 8 to further increase the strength. Even if there is no wheel device, if the bolt holes 12 of the upper fixing seat 9 are made oblong holes as in this example, even if there is an error in the height dimension of the transformer, the lower fixing seat 10 of the reinforcing body 8 can be fixed. Same installation as transformer base 15 □Place bolt 1 in close contact with 1 side 7
3. Layer property firmly fixed by ≠: Obtained.

By adopting the earthquake-resistant device according to the present invention as described above, the natural frequency in the core stacking direction of the transformer can be increased by 10H2 or more compared to the case where the reinforcing body 8≠2 is not used. This has the effect of providing a dry type transformer.

[Brief explanation of drawings]

Figure 1 is a front view of a dry type transformer according to the prior art. FIG. 2 is a front view of the same, FIG. 3 is a side view of an embodiment of the present invention applied to a wheeled dry transformer, FIG. 4 is a front view of the same, and FIG.
6 is a side view of the same, FIG. 7 is a side view of another embodiment of the present invention applied to a dry type transformer without wheel devices, and FIG. 8 is a front view showing only the reinforcing body of the seismic device. It is a front view of the same. 1: Iron core, 2: Coil, 3: Core fastener, 7: Transformer installation surface, 8: Reinforcement body, 9: Upper fixing seat, 10: Lower fixing seat, 11.15: Fixing bolt, 12 + Figure 1
Figure 2! No 3 map Prefecture 4 map Horse 5 map 60 (aan (b) $7 map Depth 8 map

Claims (1)

[Claims] A reinforcing body having a fixing seat for fixing to the upper core fastener of the transformer on the upper part and a fixing seat for fixing to the transformer installation surface on the lower part is arranged facing the end face parallel to the stacking direction of the transformer core, and Earthquake-resistant equipment for dry type transformers is constructed by bolting the upper fixing seat to the transformer's upper core fastener.